Assertion :Though milligram is the unit of mass, it is not a fundamental unit. Reason: All practical units need not be fundamental unit.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The fundamental unit of mass is kilogram. Milligram is not a fundamental unit.
All practical units need not be fundamental units.
They are derived for our practical easy.
Therefore, both assertion and reason is correct. And reason is the correct explanation for assertion.

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